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ALLEGAN — Recent water testing of Dumont Lake showed negative results for toxic algae, the Allegan County Health Department confirmed on Wednesday, July 17.

The Michigan Department of Environment, Great Lakes, and Energy performed testing on algal blooming on Friday, July 12, following the reported deaths of a dog and wildlife which were exposed to the lake water.

A contractor with EGLE treated the northeastern and northwestern shorelines on June 4 and July 8.

The state-issued permit allowed the contractor to use copper sulfate, flumioxazin and diquat dibromide along the shores of seven properties to control aquatic plants and algae. Flumioxazin and diquat dibromide are used as herbicides.

EGLE says it was alerted to several cases of sick dogs in the area of Dumont Lake Campground, including a dog that died.

State officials also said they received reports of two dead turtles, a dead raccoon and approximately 20 dead birds at the lake. An Allegan County Health Department employee told WOOD TV-8 on Monday the department had no reported human illnesses tied to Dumont Lake.

EGLE is investigating whether the contractor properly notified residents by posting warning signs every 100 feet in the treatment area and adjacent properties ahead of time. At least one woman in the area said no one was informed beforehand.

However, the state says if the treatment area is less than two acres, which was the case for Dumont Lake, no warning signs are needed at public access areas and parks that are not next to the treated area.

The Michigan Department of Agriculture and Rural Development and the Department of Health and Human Services are handling the investigation into illness reports.

*Original article online at